Cell Types
Download 0.67 Mb.
|
LETTER OF INVITATION
- Navigate this page:
- Stage
- Objective lens
- Coarse and Fine focus
- Show labels
Introduction: Complex organisms are made up of smaller units, called cells. Most cells are too small to be seen by the naked eye. Microscopes are used to magnify small objects, so here you will use a compound light microscope to observe the cells of different organisms. Question: What are similarities and differences between cells from different organisms? Match: Read about each microscope part. Match the description to the part on the diagram. B Stage: Platform where a slide is placed. A Eye piece: Lens at the top of the microscope that the user looks though. This lens most commonly magnifies a sample by 10x. C Coarse focus knob: Large knob that moves the stage up and down to focus the sample. D Fine focus knob: Small knob that moves the stage over a short distance to refine the focus. E Objective lens: A second lens that further magnifies the sample. Microscopes usually have several objective lenses with different magnifications. The total magnification is the product of the eyepiece magnification and the objective lens magnification. F Slide: A rectangular piece of glass upon which a sample is mounted for viewing under a microscope. Manipulate: With 40x selected, use the Coarse and Fine focus sliders to focus on the sample. Then, choose 400x and focus on the sample using the Fine focus slider. Which focus knob is easier to use at 40x? 400x? 40x Turn on Show labels. What structures can you see in human skin cells? Cytoplasm, Nucleus and cell membrane Turn off Show labels and turn on Show scale bars. The scale bar has a width of 20 micrometers, or 20 μm. (There are 1,000 micrometers in a millimeter.) Using the scale bar, about how wide is a human skin cell? 35µm Download 0.67 Mb. Share with your friends:
|